Search for CH341SER.EXE (SHA256 verified from WCH.cn) – that works on 99% of JK 721 plotters. Avoid "driver updater" tools completely.
Once installed, check these three things: Jk 721 Cutting Plotter Driver BETTER Download
Many users download the CH340/CH341 USB-to-Serial Driver , which is frequently the core requirement for modern Windows systems to recognize the plotter. Search for CH341SER
You have the file. Now, throw away the instructions that came with the plotter. Here is how to install the version correctly. Jk 721 Cutting Plotter Driver BETTER Download
Without the correct driver, the Jk 721 is an expensive paperweight. With the Jk 721 Cutting Plotter Driver BETTER Download outlined above, your machine transforms.
Many JK 721 plotters come with a mini-CD or USB stick. The folder named Driver contains the correct one. If lost: